68955879857 has 4 divisors (see below), whose sum is σ = 68956406640. Its totient is φ = 68955353076.

The previous prime is 68955879847. The next prime is 68955879887. The reversal of 68955879857 is 75897855986.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 68955879857 - 2³⁴ = 51776010673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68955879847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100994 + ... + 384852.

It is an arithmetic number, because the mean of its divisors is an integer number (17239101660).

Almost surely, 2^68955879857 is an apocalyptic number.

It is an amenable number.

68955879857 is a deficient number, since it is larger than the sum of its proper divisors (526783).

68955879857 is a wasteful number, since it uses less digits than its factorization.

68955879857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526782.

The product of its digits is 1524096000, while the sum is 77.

The spelling of 68955879857 in words is "sixty-eight billion, nine hundred fifty-five million, eight hundred seventy-nine thousand, eight hundred fifty-seven".